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assdraw: Properly approximate circle for rounded box

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source: http://spencermortensen.com/articles/bezier-circle/
This commit is contained in:
ChrisK2 2014-12-05 18:20:37 +01:00
parent 020897b5d3
commit e883c48caa
1 changed files with 5 additions and 4 deletions
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9
player/lua/assdraw.lua
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@ -76,22 +76,23 @@ function ass_mt.rect_cw(ass, x0, y0, x1, y1)
end
function ass_mt.round_rect_cw(ass, x0, y0, x1, y1, r)
local c = 0.551915024494 * r -- circle approximation
ass:move_to(x0 + r, y0)
ass:line_to(x1 - r, y0) -- top line
if r > 0 then
ass:bezier_curve(x1, y0, x1, y0, x1, y0 + r) -- top right corner
ass:bezier_curve(x1 - r + c, y0, x1, y0 + r - c, x1, y0 + r) -- top right corner
end
ass:line_to(x1, y1 - r) -- right line
if r > 0 then
ass:bezier_curve(x1, y1, x1, y1, x1 - r, y1) -- bottom right corner
ass:bezier_curve(x1, y1 - r + c, x1 - r + c, y1, x1 - r, y1) -- bottom right corner
end
ass:line_to(x0 + r, y1) -- bottom line
if r > 0 then
ass:bezier_curve(x0, y1, x0, y1, x0, y1 - r) -- bottom left corner
ass:bezier_curve(x0 + r - c, y1, x0, y1 - r + c, x0, y1 - r) -- bottom left corner
end
ass:line_to(x0, y0 + r) -- left line
if r > 0 then
ass:bezier_curve(x0, y0, x0, y0, x0 + r, y0) -- top left corner
ass:bezier_curve(x0, y0 + r - c, x0 + r - c, y0, x0 + r, y0) -- top left corner
end
end